Just bouncing some thoughts and ideas here.
We bought a VW Transporter that had an intermittent oil pressure light last month and it has seemingly fixed itself.
The van had been sat for 3 years prior, moving only for occasions reasons such as its annual inspection. I viewed the van last month and during the test drive the oil pressure light came on. The owner seemed genuinely confused and apologetic and sent it into a garage the next day. An oil flush was completed (Liquimoly Oil Flush), a new oil filter was installed (Mann HU719/7), the oil was changed (Quantum Longlife 5w30) and a new oil pressure sender was installed. The owner contacted me and said the van was fixed so I went back up, took it on a 2nd prolonged test drive where the the oil pressure light stayed off, and I verified that a new sender was fitted so I bought the van.
About an hour into the drive home, oil pressure light again. I pulled over, removed the oil cap and verified I could see oil in the head so carried on figuring it was a wiring issue. During the 6 weeks we've had our van, the oil pressure light issue has gone from a daily every-single-drive occurrence, gradually reducing in frequency until not seeing it now for 2 weeks. I drove over 300miles on the weekend and not once did it come on!
Things to note, not knowing the garage had done a flush and oil change when they replaced the sensor, I recently did another oil change with Mobil 1 FS 0w40. I noted a fair amount of sludge, hard carbon and bits of what looked like gasket material in the filter. My current thoughts are that the flush has loosened up some gunk in the engine which over time found it's way to the filter. From seeing the oil pressure light once every few days to it no longer coming on at all, seems to coincide with the oil change. The oil pressure light always seemed to come on at lower RPM AFTER an acceleration where 3000rpm+ was used.
I'm thinking that the oil pressure relief valve had been sticking open causing the low oil pressure light to illuminate, but still flowing enough oil around the engine not to cause any serious harm. Either regular use, the oil flush, the Mobil 1 0w40 or a mix of all 3 has now freed up whatever was causing it to stick. Is this plausible? Is it something that could even happen?
Also, when do I do the next oil change? I have 20 litres of Mobil Devlac MX ESP 15w40 currently on the way to me along with a new oil filter and a magnetic oil plug. Would you change out the Mobil 1 0w40 after a few weeks? Or, should I just wait it out for 6 months?
We bought a VW Transporter that had an intermittent oil pressure light last month and it has seemingly fixed itself.
The van had been sat for 3 years prior, moving only for occasions reasons such as its annual inspection. I viewed the van last month and during the test drive the oil pressure light came on. The owner seemed genuinely confused and apologetic and sent it into a garage the next day. An oil flush was completed (Liquimoly Oil Flush), a new oil filter was installed (Mann HU719/7), the oil was changed (Quantum Longlife 5w30) and a new oil pressure sender was installed. The owner contacted me and said the van was fixed so I went back up, took it on a 2nd prolonged test drive where the the oil pressure light stayed off, and I verified that a new sender was fitted so I bought the van.
About an hour into the drive home, oil pressure light again. I pulled over, removed the oil cap and verified I could see oil in the head so carried on figuring it was a wiring issue. During the 6 weeks we've had our van, the oil pressure light issue has gone from a daily every-single-drive occurrence, gradually reducing in frequency until not seeing it now for 2 weeks. I drove over 300miles on the weekend and not once did it come on!
Things to note, not knowing the garage had done a flush and oil change when they replaced the sensor, I recently did another oil change with Mobil 1 FS 0w40. I noted a fair amount of sludge, hard carbon and bits of what looked like gasket material in the filter. My current thoughts are that the flush has loosened up some gunk in the engine which over time found it's way to the filter. From seeing the oil pressure light once every few days to it no longer coming on at all, seems to coincide with the oil change. The oil pressure light always seemed to come on at lower RPM AFTER an acceleration where 3000rpm+ was used.
I'm thinking that the oil pressure relief valve had been sticking open causing the low oil pressure light to illuminate, but still flowing enough oil around the engine not to cause any serious harm. Either regular use, the oil flush, the Mobil 1 0w40 or a mix of all 3 has now freed up whatever was causing it to stick. Is this plausible? Is it something that could even happen?
Also, when do I do the next oil change? I have 20 litres of Mobil Devlac MX ESP 15w40 currently on the way to me along with a new oil filter and a magnetic oil plug. Would you change out the Mobil 1 0w40 after a few weeks? Or, should I just wait it out for 6 months?
